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-rw-r--r--Documentation/devicetree/bindings/rtc/rtc-m41t80.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt b/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
index c746cb221210..cdd196b1e9bd 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
@@ -21,10 +21,19 @@ Optional properties:
clock name
- wakeup-source: Enables wake up of host system on alarm
+Optional child node:
+- clock: Provide this if the square wave pin is used as boot-enabled fixed clock.
+
Example:
rtc@68 {
compatible = "st,m41t80";
reg = <0x68>;
interrupt-parent = <&UIC0>;
interrupts = <0x9 0x8>;
+
+ clock {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <32768>;
+ };
};